9800gt vs. 4830

Now im more of an Nvidia fan but i need unbiased people to tell me facts whcich is better i want to play crysis near full spec on a 1440 X 900 screen i ahve 3 gb of ram and 2.7 Ghz Processor
Other games i like to play are BfME2 and RTS games now which one is better those are th ones i want nothing more nothing less many thanks \
ALSO I ONLY BUY FRO NEWEGG SO SEND ME A LOINK ON THE BEST ONE FROM NEW EGG OF THE TWO

I just got home from a really tough afternoon at the office. We had a terrible snowstorm, which meant no walkins.. I played Crysis all afternoon. 1680x1050 on a GTX280 and 37" LCD... All details maxed, 4x AA. *drool*

I can tell you that even a GTX260 doesn't do that, so I can't see a 9800GT doing it.